void Remove( 
   ICookieItem item
)

// http request with cookie container
ZennoPoster.HTTP.Request(InterfacesLibrary.Enums.Http.HttpMethod.GET, "https://zennolab.com", cookieContainer: project.Profile.CookieContainer);
// get avaliable domains for container
var domains = project.Profile.CookieContainer.Domains;
if (domains.Count() > 0)
{
    var items = project.Profile.CookieContainer.Get(domains.First());
    // remove some cookie from container
    project.Profile.CookieContainer.Remove(items.FirstOrDefault());
}